may I have the correct answer and detailed explanation? thanks!!

Question 2 (15 marks) Consider a monopolistically competitive market for good X produced by rm A facing a demand function P = 1000 3Q. Firm A's marginal cost and average total cost at a production level Q are respectively MC = 4Q and ATC = 400\" +40. a) What is the shortrun economic prot or decit for rm A? (4 marks) b) Your student comments that in the long run firm A will earn zero economics profit, and therefore there is no deadweight loss in this market. Do you agree? Explain briey in terms of the concept of Pareto efciency. (4 marks) Now, the market for good X is changed into an oligopoly market. And good X is produced by firm A and B , which face a demand function P = 1000 5Q. Firm A's marginal cost and average total cost at a production level Q are respectively MC=4Q and Arc=%+4q. Firm B's marginal cost and average total cost at a production level Q are respectively MC=6Q and ATC=%+6Q. c) What is the market supply curve for good X? (1 mark) d) What is the market price and market output for good X if rm A and B cooperates as a cartel? (2 marks) e) What is the output and profit of rm A and B respectively, if they cooperate as a cartel? (4 marks)